Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c15f8904d164039…

MALICIOUS

PDF

39.0 KB Created: 2020-09-06 17:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10dac75147bdf22c2e12c219fe76a837 SHA-1: 3844bccd142b84eac7839a58576f92d463deccff SHA-256: 7c15f8904d164039f82e1aff4c4a0543850aa6bcae10c87bbb539b5b9f36a068
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains URLs that suggest a lure related to educational worksheets. The primary malicious URL identified is a redirector that likely leads to further malicious content. No scripts were extracted, but the PDF structure and embedded links indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/pify?keyword=bodmas+worksheets+for+grade+4+with+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/bd1c09_60f60249511c41c3bffcfdaae11f4961.pdf
    • https://static.usrfiles.com/ugd/c068f8_0dd51afca2d74865b338cb1111c32381.pdf
    • https://static.usrfiles.com/ugd/b90ba1_b7f674e3d3e14255bd134efaaf03ab67.pdf
    • https://cdn.shopify.com/s/files/1/0428/0074/2567/files/zoduguvasikilixivajaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2051/files/48459695133.pdf
    • https://static.usrfiles.com/ugd/5b5da7_08be4c569838461fb37ff12e1e67a248.pdf
    • https://static.usrfiles.com/ugd/9c43ec_b2c67f6d1c4e4c948d47847ffd415cee.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fa7436b38b74139a51249956fe8d110.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_808f3bdf0bca4573be9911468818358c.pdf
    • https://static.usrfiles.com/ugd/aec2ea_f81b690aa3854f5b93ad592e681a7466.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1294/files/cub_scout_wolf_leader_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8444/files/kolopi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56655156305.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a93.bin
54bf2091b75fbef50fcbd2fb4462e4cffb5bea62428df2ea7d2f05e5a31a2010
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A93 5580 bytes
font_01_sfnt_off00006d85.bin
99185f9dbb2da660e652571db07e195e87b76cba842d94911c85a8d692cf2e88
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D85 9836 bytes